Samsung's facial recognition unlock lets you activate your Galaxy S8 just by looking at it.

But it could be a more than four years before it's secure enough to be used for Samsung Pay, reported The Korea Herald, citing a source within the electronics giant.

Today, fingerprint readers (and in Samsung's case, the iris scanner) secure mobile payment services like Apple Pay, Android Pay, and Samsung Pay for millions of people.

Face unlock, on the other hand, has been reportedly fooled by photographs.

Making facial recognition a way to authenticate mobile payments could be more convenient than both the iris scanner and fingerprint reader.

"In order for facial recognition to be solely used for financial transactions, it would take more than four years considering the current camera and deep learning technology levels," according to The Korea Herald's source.

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